Harbor Talbot is thirteen when he receives a mysterious box from Alcatraz. Inside, is his grandfather's diary, mysterious letters from a beautiful and reclusive poet, and evidence that his Grandpa Shep could be the infamous Water Ghost, a restless spirit who haunts the lake near their small Oklahoma town. Harbor teams up with Olivia, new to town, with a special connection to the poet. Will they find what the Water Ghost is looking for? Or will they be pulled under, doomed to share the ghost's watery grave?